Calling device.



H. HOVLAND.

CALLING DEVICE.

APPLICATION FILED FEB. I2. I9I5. 1,171,520. Patent-ed Feb.15,1916.

5 SHEETSSHEET I.

VV/fnesses: fm emarx 0.9171, ,60%

H. HOVLAND.

CALLING DEVICE.

APPLICATION HLED FEB. 12. 1915. 4 1,171,520. Patented Feb.15,1916.

5 SHEETS-SHEET 2.

VWfnesses:

(n ven/arx 58%. 3 m.- Henry hov/anaf H. HOVLAND.

CALLING DEVICE.

APPLMAHON HLED FEB. 12. I915.

1,171,520, Patented Feb.15,1916.

5 SHEETS-SHEET 3.

Wfnesss's: /n vemor: @997 Her/r y Hav/and H. HOVLAND.

CALLING DEVICE. APPLICATION FILED FEB. I2. 1915.

1,171,520. Patented Feb. 15, 1911s.

5 $HEETSSHEET 4.

VV/ffless 6.5. /nve/7 for: .3911. 542i;

Henry H0 v/and H. HOVLAND.

CALLING DEVICE. APPLICATION men FEB. 12 1915.

1,171,520. Patented Feb. 15,1916.

s SHEETS-SHEET 51 H E 2 TED STATES PATENT OFFICE.

HENRY HOVLAND, OF EAST ORANGE, NEvV JERSEY, ASSIGNOR, BY MESNE ASSIGN- IMENTS, TO WESTEBN ELECTRIC COMPANY. INCORPORATED, A CORPORATION OF NEW YORK.

CALLING DEVICE.

Specification of Letters Patent.

Patented Feb. 15, 1916.

To all ulmm it may concern:

lie it known that I. HENRY Hovnasn, a citizen of the l nited States. residing at last Orange, in the county of Essex and State of New Jersey. have invented certain new and useful improvements in Calling Devices, of which the following is a full, clear, concise, and exact description.

This invention relates to improvements in calling devices for automatic telephone systems, and more particularly to a controllim, device of the. class adapted to receive and count impulses which are generated or produced at the selector which is for the time being: under the control of said device. In such svstcms impulses are sent from a central 1 ation, on the one hand to the calling device located at the telephone substation, and on the other hand to automatic selector switches .t'ocated at the central and by means of which a connection may be cs7 tabtished between acalling and 11 called subscribm'. An impulse mechanism provided in the calling device counts off the impulses sent from the. central station, means being provided to prevent. the sending of more impulses tlian predetermined by the movable or setting member of the calling device.

According too'ne feature of the invention, the movable or setting member is locked against'actuation after it has been set and is llIliOChCtl only after the desired effect of the impulses, i. c. the movingf of the automntic switch to a desired position, has been accomplished. Due to this locking of the setting member during the operation of the impulse counting mechanism, the operator cannot interfere with the proper sending of impulses by actuating thesetting member before the counting-cit of all the impulses.

Another feature of this invention relates to means for locking the. impulse counting mechanism during the sctting'of the movable or setting member and also whilethe device is in its normal position.

In the din-wings, the calling device is represented in connection with an automatic telephone system in vvhirh the subscriber controls the setting of. the selector switches, only as much being shown of the circuit arrangements and selector switches as is necessary for the understanding of this invention- It will be apparent, however, that the calling device forming the subject matter of this invention mav readily be adapted for use with systems of widely varyingcharacter. such as; for instance semi-automatic telephone systems. electric signaling systems, etc.

Figure 1 is a perspective view of the calling' device with parts broken away so as'to' showithe interior mechanism of the device; Fig. 2 represents a top view of the calling device; Fig. 3 a sectional view along lines 3-3 of Fig. 7; Fig. r is a sectional view along lines 4% of Fig 7; Fig. 5 is a sectional view alone lines 5 of Fig, 7; Fig. G is a. side elevation partly in perspective: Fig. 7 is a sectionatvieiv along lines 7? of Fig. 6; Figs. 8 and 12- show the escapement and locking mechanism; Figs. .9, 10 and 11 show details of the locking mechanism: Figs. 13, H. 1.5 and 16 show thei npulse sending mechanism in ditt'erent po sitions during the operation of. the sender Fig. 17 shows.- the sender mounted in the base of a desk telephone stand, and Fig. 18 represents diagrammatically the connecmounted on a frame 1, through the center;

A plate .4

of which is extended a shaft 2. carrymg numerals 1 to 0 is' secured to shaft 2 by means of a screw 3 m such amanner that the shaft may revolve with respect to plate 4. A projcction'o of number plate t is fastened totramol by means of screw 6. This projection 5 serves as a stationary stop for the finger of the operator to limit the forward movement of a dial 7. Around the. periphery of dial 7 a continuous series of finger holds 8 are provided. Dial 7. is secured by means of a screw 9to hub 10 mounted on the end of shaft 2, and may be moved by means of the finger hoidsin a clockwise direction. Rigidly mounted on the hub 10' is as er-wheel i2. Loosely mounted on shaft 2 a star-whee: 13 ca rrying a member 14. Between the long projec tion" 15 and short projection 16 of niember 23 is fastened'a notched wheel 24. The cupshaped wheel23 incloses a power means, as for instance a motor spring 25, one end of which is fastened to the wheel itself and the otherend to shaft 2.

Pivotedin frame 1, by means of pin 26, is a pawl 27"carrying a roller 28 and a member 29;, Pawl 27 is adapted to engage the notches of wheels 12, 13, 19 and 24. The actuation of pawl 27 is controlled by a lever 31 mounted on shaft 2 below dial 7. A bentdown portion of lever 31 is connected by means of a pin 32 with a movable lever 33. The other end of lever 33 is secured to shaft 34 extending from frame 1; shaft 34 carries also a, lever 35. On the free end of lever 35 is mounted a. roller 36. Spring 37 is fastenedat one end to frame 1 and at the other end to lever 35,and keeps lever 35 with its roller 36 in engagement with a projection 37 of member 29 forming a part of pawl 27. In this position of roller 36, pawl 27 and roller 28 are kept out of engagement with the notches, of wheels 12,13 and 19, and proiection-38 of member 29 is kept in one of the notches of wheel 24 as shown in dotted lines on Fig. 9. Upon the actuation of lever 3,1, roller 36 rides on the periphery of member 29 and causes pawl 27 to engage notches .of the notched wheels as will be described In its extreme forward position,

projection 40 of contact spring41. Movably mounted on member 29 is a member -42,

which, when engaged by a lever 43, releases roller 36 to its normal position.-

Mounted on bridge 44 by means of screws 45'45 is a U-shaped electromagnet 46 having two pole pieces 47 and 48. "Eachleg of electromagnet 46 carries an=energizing coil! 49 and 50 respectively. Pivoted in yoke 51 of electromagnet 46 is a shaft 52 carrying armature 53. Armature 53 is transversely pivoted between the pole pieces, as shown in Fig. 5.- Coiled spring 54 tends to main-- tain the armature 53 in contact with adjusting screw 55, and causes the armature to return to this position when released by theelectromagnet. Pivoted between the frame 1 and a, projection 56 to bridge 44 is a shaft 57 carrying a pinion wheel 58 and a rod 59.

The pinion wheel 58 is intermeshing with gear wheel 23. Rod 59 and member 61 provided on armature 53 coiiperate in such a manner that, due to the movement of arma ture 53 in response to the intermittent energization"of pole pieces 47 and 48 and the action of spring 54, wheels'24, 23 and 19 are moved step by step under the control of motor spring 25. In its initial position rod 59 engages, for instance, the outer surface of the shortbent-up portion of member 61.

Upon the attraction of armature 53 by pole pieces 47 and 48, red 59 is released by the shorter bent-up portion of. member 61, and

Upon the deenergization of the electromagnet, armature 53 is returned to its initial position by coiled spring 54, and thereby rod 59 is released by the longer bent-up portion of member 61 and again engages the outer surface of the shorter bent-up portion of member 61. Under the control of the escapement arrangement (comprising armature 53, member 61 and rod 59) the impulse couning mechanism, (2'. 6. wheels 24, 23 and 19) is stepped in accordance with the set position of the dial, as will be hereinafter described.

The subscriber desiring to initiate a call removes his receiver from its switchhook, closing thereby anenergizing circuit for relay 65 from grounded battery at the exchange through the left-hand winding of relay 65, back contact 66 and armature 67 of relay 68, and then at the substation through switchhook 69, contact 70, winding 71 of the induction coil, transmitter 72,

' contact 76. of relay 68. Relay 65 upon enerization closes a circuit from earth through 1138 armature, front contact and righthand winding, and winding of relay 68to grounded'battery 77.. Relay 68 is energized and opens the original energizing circuit of relay 65. Relay 65, however, is maintained energized by current flowing in the circuit. established through the right-hand winding of this relay. Relay 68 closes also an energizing circuit for relays 78 and 79 from grounded battery 80, through the winding of-relay 78, front contact 81 and armature 67' of relay 68, subscribers loop through springs 73 and-74, armature 75 and front contact-.82 of relay 68, conductor 83, armature and back contact of relay 86, and winding of relay 79 to earth and back to battery.

ture, short circuits. relay 65 through arma ture 87 of relay 6.8 and maintains relay 68 energized, the original circuit of this relay being 'opened upon the release of relay 65. By attracting its right-hand rmature, relay 7 8 closes an energizing circuit for'magnet 89 of a sequence switch 84 through the lefthand armature and back contact of relay 90.

Only the power magnet 89 and contact springs 91' to 95 are shown (in Fig. 17) of sequence switch 84. By means of magnet 89 and a clutch mechanism 96' a rotatable shaft 97 on which a plurality of cams are provided, is brought into engagement with a constantly revolving power means 98 and is rotated thereby. The cams are arranged to actuate contact springs 91 to 95 in certain positions of the shaft. The positions in which the cams actuate springs 92, 93,- 94

hmniiw ill ill lgiimi; Z'Llii) T8, lIUWEVPI', be- :eviiiig i'wmiin-tril energized, until it was chasm; from grounded battery (K ihimigh. mil m" relay 78, front Contact 81 (if relay HS, switi'hhnolit (39,

1 H 2 1M, Iii u ll zi'iiiiiwi i :1 vii m I). lfl lililff 71 (if the iiii'hiction coil, 1 .i '01 7:2 and contact springs 73 and 41 iii-Win! I .iiu l giiisii ihv mih itroii 351d hack to hutpn ym: iiiiignet 89 hm timir ii; iis Pond pusition, re-

bWUiiH fiuiglimail hiking inil 'iiit mm battery 10?), through i m i'vizi s iii), seqiumw swim-h spring 1 in piisiitim. 13. winding m? relay 80 ii iisizi hir sl; vmiiiici s-iiii ai'nuitm'fif i'vliiy T9 mpigil in earth.

tui'c and flflllhih sxi iii'h Spring 94- hi mirth iii ilpiiltilig (nil llHL Hvhiy -90 closes also it vim-nit to (him the sequence s vitvh out Ji -mg H e u of it secmul into its third position from i7. frl'igl this earth through right-hand. armature and z h fli i3 from. i-mituct (if m l-1y TH, left-hand armatum illil limit mmtzict of i'vlzly 9), sequence swi'ivli spiieg '2 mail pmvvi' nmgiiet- 89 to gnu-iii. led hatter In pii siliiiiii 3 of the sequence switch, pi'iwci' iniigiivc U)? of switch 108 is energizwl. a ('n'c'iit being ClOSHi from iiiliii through piglib-hziiiif Front, contact- UJi mini tin-0 0f whiy T-w, left-hand armature and i'imii wiiiaiciv of relay 90, sequence swith spri -m 5 1:. mil Ui nizignet 107 to gi'uumied mite pnn the ciiei'gimtimi (If izi'igiiet 101", pm'ii 109 piessim rod 110 Hg'HilZSt ii conp cs hy him-hes 11:3 and I13 ii; traw upward. hes I12 iniwi ave." a contact hank 114 iii \i'iiii-h mimic Ui' .siihsLi-ihvi-s lines termi- L'L'IU- iiiiil hr'mh H3 travel-i over an interruj'ziei i iizite 11 Relay H43 iipmi viiei'ggizmtiun vhiruxl a ciriii friiizi gifilihtiid hiiih-i'y HG through its mmw ink-Ii: vontiict and iii'maitiii'o, coniliivior 83,

front contact 82 and armature of relay 68, coils of magnet 46 at the substation, and contact springs 73 ant 41 to earth and back to battery. Relay however, was not energized for a sufficient length of time to cause the actuation of magnet 46, its circuit being opened at sprin 93 as soon as the sequence switch left its second position.

\Vhen wiper 113 of switch 108 reaches the first conducting segment 117 of interrupter 115, a circuit is closed from grounded battery 118 through the frame of interrupter 115, conductor 119, sequence switch spring 93 (in position 3), coil of relay 8(3 and back contactand armature of relay 79 to earth and back to battery. Relay 8G is again energized, and by attracting its armature closes the above traced energizing circuit for magnet 16 provided in the subscribers calling device. This magnet becomes now energized and attracts its armature 53, allowing rod 59 to disengage the outer surface of the shorter arm of escapement member 61 and to engage the inner surface of the longer arm of said member. Rod 59 and the pinion wheel perform, during this movement of the armature 53, half a revolution, and will cause the impulse mechanism. comprising wheels 24, 23 and 19 engaged by pinion 58 through ratchet wheel 23, to move a distance equal to one space between the centers of adjacent notches on wheel 24, which distance is equal to that between one finger hold 8 on dial 7.

Relay 86 is intermittently dei nergized and energized as cam travels over conducting and non-conducting segments of interrupter plate 115. ln response to each energization of relay 86, magnet 46 in the calling device is actuated and causes through the agency of the escapement mechanism, the stepping of the impulse mechanism in the above described manner. When wiper 113 passed over the fifth conducting segment of interrupter 115 and wipers 112 are resting on the fifth row of terminals 114, representing digit No. 5, magnet 46 causes the impulse mechanism to perform the fifth step.

\Vhen magnet 46 received the fourth impulse, star-wheel 19 was brought to a position in which pin 100 of star-wheel 12 again engages fork-shaped member 17. During the fifth step of star-wheel 19 the fork-shaped member is again moved, but now in the opposite direction of its first movement. The longer arm of fork-shaped member 17 engages now pro ection 15 of member 14 provided on wheel 13 and causes the restoration of this wheel to normal. After the impulse sending mechanism has been moved a distance equal to 5 finger holds 8 on dial 7, e., five steps, the notches of starwheels 19 and 13 are again in alinement. allowing roller 28 of pawl 27 to fall into the notches of these wheels as it is shown in Fig.

113 of switch 108 10. The member 29 of pawl 27 no longer presses roller 36 of lever 35 against the projection 40 of spring 41. and said roller is released thereby to its normal position, allowing spring 11 to disengage spring spring 74 to engage this latter spring. As roller 36 bears now against projections 37 of member 29, pawl 27 is caused to unlock wheels 12, 13 and 19 and to lock, by means of projection 39, wheel 21. Lever stored to normal together with roller 36 2'. e. lever 85. Dial 7 remains in the position to which it as moved by the operator. Any one of finger holds 8 may be opposite any numeral on plate 4. a continuous series of 80 holds 8 being provided on dial 7. Relay 86 being decnergized at this time. as soon as contact spring 73 engages contact spring 71 the circuit of relay 79 will again be established. Upon energization relay 79 closes 5 through its front contact and sequence switch spring 95 an energizing circuit for magnet 89 and causes semienceswitch 84 to move out of its third position. The sequence switch being moved out of its third position, 90

power magnet 107 of switch 103 is deenergized, and the switch arrested thereby with its wipers in contact with the fifth row of terminals on bank 114.

If the operator that the selected finger hold was not the right one. he can prevent the operation of the impulse mechanism by hanging up his receiver on the switclihook. In this case, rod 120 engages, through the agency 0 lever arrangement 121. lever 13 of the call: ing device. Lever 43 is pivoted at 122 and upon actuation engages with its projection 123 a projection 124 on the movable member 42 provided on 29 of pawl being moved downward releases roller 36 from projection 40 of spring 41 in the same manner and with the same effect as it is described above in connection with member 29. On the other hand. projection 43 engages armature 53 of electromagnet 46 and prevents thereby the operation of the escapement mechanism; The operator can in the same manner prevent the further,

actuation of the impulse mechanism at any stage of operation thereof.

\Vhat is claimed is: i. In a calling device, a movable member,

a power means adjusted responsive to the movement of said member, an impulse count-120 with an endless series of finger holds, asta- 130 73 and 70 31 is re- 75 finds after the dial 7 is set 27. Member 42 125 of lever tionary plate carrying numerals each of which may be opposite any one of said finger holds. a motor spring wound up by the actuation of said dial, a notched wheel locked during the actuation of said dial, a pivoted pawl for locking said dial in its actuated po sition. an electromagnet, means controlled thereby for moving said notched wheel, and means operative after said notched wheel has been moved a distance determined by the movement of the dial for unlocking said dial and for locking said notched wheel.

3. In a calling device, a dial having a plurality of optn'ating positions, finger holds for a tuating said dial, a lever adapted to be actuated by engagement. with the finger in a tinger hold. means operative thereby to hold said dial locked when moved to any of its operating positions. an impulse counting mechanism. an electron'iagnet to control said mechanism. and means controlled from a distant station and operative upon the locking of said dial to actuate said electromagnet.

4. in a calling device, a movable member, a power storing mechanism connected with said movable member and adapted to be adjusted responsi e to movement of said member. an impulse counting mechanism, an electromagncl, means for locking said member whenever said mechanism is unlocked and for locking said mechanism wlnsnevcr said member is'nnloched. and means under the joint control of said power storing mechanism and said electromagnet for operating said impulse counting mechanism.

5. In a calling device, a number plate, a forwardly moving finger hold dial, a notched wheel fixed thereto, a locking member, a movable lever adapted to be engaged by the finger when in a finger hold, a stationary stop, said lever when engaged by the finger upon actuation of the dial controlling said locking member to engage said notched a wheel to lock the dial. an electromagnct, an impulse counting mechanism controlled thereby after the locking of said dial, and means for unlocking said dial after said mechanism has operated.

(3. In a calling device, a movable member, a series of finger holds for actuatingsaid member, contact; springs, an electromagnet, an impulse counting mechanism, a lever actuated by engagement with the finger in a selected finger hold, means controlled by said lever for locking said impulse counting mechanism in the normal position and during the actuation of said movable member, p' wcr means stored up during the actuation of said member, and means controlled by said lever to apply said power means to said impulse counting mechanism and to lock said member during the operation of said mechanism.

7. In a calling device, a movable member having a plurality of operating positions, an impulse mechanism adapted to be actuated in accordance with the set position of said member, a pair of relatively movable starwheels comprised in said impulse sendin mechanism, a pawl adapted to lock sai mechanism when the dial is in the normal position and during its movement to an operating position and to lock said dial while said mechanism is actuated, the locking of said mechanism being prevented while said star-wheels are in a relatively displaced position.

8. In a calling device, a movable member, an impulse counting mechanism locked during the. actuation of said member, means' for unlocking said mechanism and locking member after the latter has been set to the desired position, an electromagnet, means controlled thereby for stepping said mechanism in accordance with the set position of said member, means operative thereafter for unlocking said member, and means controlled by the operator for preventing the stepping of said mechanism and for unlocking said dial at any stage of operation of said impulse counting mechanism.

9. In a calling device, the combination with a rcvoluble dial having a plurality of operating positions. a series ot adjacent finger holds for actuating said dial, cooperative contacts, a lever adapted to be actuated by engagement with the linger in a finger hold, means controlled by said lever for simultaneously locking said dial against further actuation. when moved to any of its operating positions and for actuating said contacts, an electromagnet, an in pnlse counting mechanism controlled thereby, means for controlling said electromagnet when said contact springs are actuated and means for unlock ing said dial, locking said mechanism and releasing said contact springs after the impulse countir g mechanism has operated in accordance with the set position of said dial.

In witness whereof, I hereunto subscribe my name this 9th day of February A. 1).,

HENRY HOVLAND. Witnesses E. EDLER, K. L. STAIIL. 

